Peened rivets - how to know if hot or cold?

Randy-IA · Aug 30, 2008

Hi All, I posted this on Implement alley too. I was looking for a slip/over-running friction disc for my 14t baler on a previous post there. Well they are available from mommy Deere and it'll only cost a small fortune. I asked in that post about how to rivet the disc back on. I'll figure that one out but now I need to know if there's a way to know the difference between a hot peened rivet and a cold peened rivet- OK no wisecracks !! I know, one will be hot and the other one won't

Parts people at dealer didn't know. Is there a difference ? Can the same rivet be used hot or cold? Is the purpose of hot riveting to get a tighter connection as the rivet cools and shrinks? Thanks ! ...Randy

Bob · Aug 30, 2008

Never heard of hot riveting, pertaining to baler repair. Bash the little buggers while cold, just don't get too carried away and peen them so much they expand and break the cast iron hub. (IF applicable.)

You are completely OVERTHINKING this relatively simple repair. I KNOW, I do it all the time (Make things more difficult than they really are, that is!)

Randy-IA · Aug 30, 2008

I hear ya! It's a chronic problem this over-analyzing things. I just want it as tight as possible since those six rivets take all the abuse in the drive line of the baler. That's probably what I'll do anyway. I just need to figure out how to hold everything by myself and beat on it all at the same time

...Randy

Bob · Aug 30, 2008

Put good bolts in a couple of the holes and TIGHTEN them, then smack the rest of the rivets into place. When done with those rivets, remove the bolts and put rivets in those last holes.

Sean Feeney · Aug 30, 2008

I maybe very wrong, but I thought they only used hot peened when they did skyscrapers?

T_Bone · Aug 30, 2008

Hi Randy,

Hot set rivets will be harder to drill out than cold set rivets, cold set will have slightly deformed heads (takes a good eye too see the difference), there will be "heat colors" on the rivet heads.

You need a rivet "buck"(the back die) and a rivet "set"(the peened die) for setting rivets. Hole size is critical when comparred too rivet shank size.

That's been over 40yrs ago that I learned about rivets, so I could have left something out, and most likey did

T_Bone

Walt Davies · Aug 30, 2008

Also ships bridges and anything that takes the big rivets, they are just to big to peen by hand or with rivet gun if not red hot.
Walt

Randy-IA · Aug 30, 2008

Sounds like a good way to hold the pieces together. I think I'm going to try to use a hydraulic press to mushroom the rivets. At $.23 each I can experiment some. ...Randy

Randy-IA · Aug 30, 2008

Hi. Those rivets are 5/16" shank. Flat head on them. I was told that Deere used to supply the dealers with a setting tool for this job. My local dealer shop said they used to have one but it's long gone. I have two other Deere dealers close enough to that I'll call them too. Otherwise, I'll take one of the other baler clutches apart to see how the rivets are supposed to look ( mushroomed>hardest to do, flattened>easier or quartered>easiest ) after they are peened. Then I guess I'll have to make a die for it. ...Randy

Fred P · Aug 31, 2008

I have found that an air hammer works good to set rivets. Regrind one of the chisels that come with the hammer to make a rivet set. Back the rivet up and two or three brurrts on the gun and the rivet is set.

Fred P..............

Randy-IA · Aug 31, 2008

Great idea! It sounds easier than the press even. Thanks! ...Randy

Peened rivets - how to know if hot or cold?

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